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Module: Events Organization

Entity: event.registration

Compute Method: _compute_remaining_entries

Inputs Method Outputs 
sub_registrations = dict(self.env['event.registration']._read_group(
            domain=[('main_registration_id', 'in', self.ids), ('state', '=', 'done')],
            groupby=['main_registration_id'],
            aggregates=['__count']
        ))
for registration in self:
            if registration.ticket_entry_limit > 1 and not registration.main_registration_id and registration.state != 'done':
                registration.remaining_entries = max(0, (registration.ticket_entry_limit - sub_registrations.get(registration, 0)))
            else:
                registration.remaining_entries = 0

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